Parameterize app name

src/app/components/MenuSpace.svelte

@@ -21,6 +21,7 @@
     memberships,
     roomsByUrl,
     GENERAL,
+    PLATFORM_RELAY,
   } from "@app/state"
   import {checkRelayConnection, checkRelayAuth} from "@app/commands"
   import {pushModal} from "@app/modal"
@@ -97,7 +98,7 @@
               Create Invite
             </Button>
           </li>
-          {#if !import.meta.env.VITE_PLATFORM_RELAY}
+          {#if !PLATFORM_RELAY}
             <li>
               {#if getMembershipUrls($userMembership).includes(url)}
                 <Button on:click={leaveSpace} class="text-error">